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CLAIRE T DIEP MD INC
NPI 1609958636
Internal Medicine in Union City, CA

Active since October 19, 2006
33509 WESTERN AVENUE, UNION CITY, CA 94587(510) 441-8081(510) 441-8080 Get Directions Write a Review

NPPES record last updated: July 17, 2007. Verified against the NPPES registry weekly; last sync: November 01, 2026.

About Claire T Diep Md Inc NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

CLAIRE T DIEP MD INC (NPI 1609958636) is a healthcare organization registered as an internal medicine in Union City, California and active in the NPI registry since October 2006. The organization lists Claire Thuc Duyen Diep, President, as its authorized official.

NPPES Registry Identity

NPI1609958636
Entity TypeOrganization
Primary Taxonomy207R00000X
Legal Business NameCLAIRE T DIEP MD INC
Location Address33509 WESTERN AVENUEUnion City, CA 94587
Mailing Address33509 Western AvenueUnion City, CA 94587 · (510) 441-8081 · Fax (510) 441-8080
Phone(510) 441-8081
Fax(510) 441-8080
Organization SubpartNo
Authorized OfficialClaire Thuc Duyen DiepPresident · (510) 441-8081
Enumeration DateOctober 19, 2006
Last NPPES UpdateJuly 17, 2007
✔ NPI 1609958636 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
License✔ Licensed in CA · A55900
Definition
A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.
33509 WESTERN AVENUE, Union City, CA 94587
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Other Identifiers 3

Medicare UPING64788
Medicaid00A559000CA
Medicare ID-Type Unspecified00A559001

Group Practice 1

Group TaxonomyThis provider is a business group of one or more individual practitioners, who practice with different areas of specialization.193200000X MULTI-SPECIALTY GROUP

Medicare Participation & PECOS CMS

Medicare enrollment and the clinicians who bill Medicare through this organization, from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Claire T Diep Md Inc is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Clinicians Billing Medicare Through This Organization

Medicare enrollment records show 1 clinician reassigns Medicare billing to Claire T Diep MD Inc, which bills Medicare for the services this clinician delivers.

Clinician (1)

Claire Diep, M.D.
Internal Medicine
NPI 1366508707
33509 WESTERN AVENUE
Union City, CA 94587
(510) 441-8081
✔ PECOS✔ Accepts Medicare0.1 mi

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Claire T Diep MD Inc's NPI number?

The NPI number for Claire T Diep MD Inc is 1609958636. It was assigned to this organization in the NPPES registry on October 19, 2006.

Where is Claire T Diep MD Inc located?

Claire T Diep MD Inc is located at 33509 Western Avenue, Union City, CA 94587. The listed phone number is (510) 441-8081.

What is Claire T Diep MD Inc's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

Is Claire T Diep MD Inc enrolled in Medicare?

Yes. Claire T Diep MD Inc is registered in the Medicare PECOS enrollment system.

How many clinicians bill Medicare through Claire T Diep MD Inc?

According to the CMS Revalidation Reassignment List (October 2026 release), 1 clinician (Internal Medicine) reassigns their Medicare billing to Claire T Diep MD Inc. A reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for the clinician's services. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

When was this NPI record last updated?

The NPPES record for Claire T Diep MD Inc was last updated on July 17, 2007. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 19 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.